The most common word for expressing "already" in Chinese is 已经 (yi3jing1).
However to make the meaning deeper, we say 都...了 (dou ... le); or we can use both of them.
已经十二点了, 你怎么还不睡觉?
yı3jing1 shi2 er4 dian3 le, ni3 zen3me hai2 bu4 shuı4jiao4?
It’s already twelve o’clock. Why haven’t you gone to sleep?
都十二点了, 你怎么还不睡觉?
dou3 shı2 er4 dian3 le, ni3 zen3me hai2 bu4 shuı4jiao4?
It’s already twelve o’clock! How come you still haven’t gone to sleep?
都已经十二点了,你怎么还不睡觉?
dou3 yı3jing1 shı2 er4 dian3 le, ni3 zen3me hai2 bu4 shuı4jiao4?
It’s already twelve o’clock! How come you still haven’t gone to sleep?
Source: Qingwen Chinesepod
